/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lvyh.lightframe.sharding.client.parser;

import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
import com.alibaba.druid.sql.ast.statement.SQLSelect;
import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitorAdapter;

/**
 * Table rewriting
 * Created by lvyun on 2021/10/31.
 */
public class TableNameModifyASTVisitor extends MySqlASTVisitorAdapter {

    private String tableName;
    private String newTableName;

    public TableNameModifyASTVisitor(String tableName, String newTableName) {
        this.tableName = tableName;
        this.newTableName = newTableName;
    }

    @Override
    public boolean visit(SQLSelectStatement astNode) {
        astNode.getSelect().accept(this);
        return false;
    }

    @Override
    public boolean visit(SQLSelect x) {
        x.getQuery().accept(this);
        return false;
    }

    @Override
    public boolean visit(SQLExprTableSource x) {
        x.getExpr().accept(this);
        return false;
    }

    @Override
    public boolean visit(SQLIdentifierExpr x) {
        if (x.getName().toLowerCase().trim().equals(tableName)) {
            x.setName(newTableName);
        }
        return false;
    }
}
